Tunnel waterproof drainage structure and construction method thereof

The invention relates to the technical field of tunnel waterproof engineering, and particularly relates to a tunnel waterproof drainage structure and a construction method thereof. The tunnel waterproof drainage structure comprises a flat waterproof base layer arranged on an initial supporting face in a tunnel, a drainage system installed in the tunnel, a buffer layer laid on the flat waterproof base layer and used for wrapping the drainage system on the inner side, a waterproof plate arranged on the buffer layer and a stability control device with one end connected to the reverse wrapping position of the waterproof plate; a plurality of reinforcing layers are arranged on the buffer layer; and the other end of the stability control device is fixed on the flat waterproof base layer below the waterproof plate, so that the waterproof plate at the reverse wrapping position is tightly attached to the flat waterproof base layer. According to the tunnel waterproof drainage structure and the construction method there